[Creeker]

Buy the newest tuck you can afford and run, don't walk, run as fast as you can from a Ford 6.0.

I would rather buy used from an individual than from a dealer. Many dealers buy at auction and have no clue about the history of the truck. Preferably an older mature individual. Stay away from the trucks owned by kids who modify them with tuners/exhaust and delete everything on them for performance. They do this for a reason...

There are lots of excellent used one owner diesel trucks out there if you take your time and especially if you are willing to travel a bit.